:root{
  --paper:#f7f4ee; --card:#fffdf9; --ink:#1f1d19; --ink-2:#4a463e; --ink-3:#827c70;
  --rule:#e4ded2; --rule-2:#d6cfc1; --accent:#1e5a6b; --accent-ink:#164552; --accent-soft:#e3eef0;
  --warm:#b4652a; --warm-soft:#f6eadf; --ok:#2f7a4a; --ok-soft:#e5f2e8; --err:#b23a3a; --err-soft:#f8e6e3;
  --code-bg:#fbf9f4; --code-gutter:#b7afa0; --sel:#dfe9ec;
  --t-kw:#8a3b62; --t-def:#1e5a8a; --t-str:#3c7a3c; --t-num:#b4652a; --t-com:#958e80; --t-bi:#6a4fa3; --t-op:#5d584f;
  --shadow:0 1px 0 rgba(31,29,25,.04), 0 6px 24px -12px rgba(31,29,25,.18);
  --serif:"Literata", Georgia, serif; --sans:"Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono:"JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}
@media (prefers-color-scheme: dark){
  :root{
    --paper:#151411; --card:#1c1b17; --ink:#ece7dc; --ink-2:#c2bcaf; --ink-3:#8d8679;
    --rule:#2c2a24; --rule-2:#3a372f; --accent:#7cc0cf; --accent-ink:#a5d6e0; --accent-soft:#1d2b2e;
    --warm:#e0a06b; --warm-soft:#2b2219; --ok:#7cc493; --ok-soft:#1b2a20; --err:#ef8d84; --err-soft:#2e1d1b;
    --code-bg:#181713; --code-gutter:#5a554b; --sel:#2a3a3e;
    --t-kw:#e59ac0; --t-def:#8cc4f0; --t-str:#9fd28f; --t-num:#e7b07d; --t-com:#7d776b; --t-bi:#c3a6f0; --t-op:#b3ad9f;
    --shadow:0 1px 0 rgba(0,0,0,.2), 0 8px 28px -14px rgba(0,0,0,.6);
  }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 var(--sans);font-feature-settings:"cv11","ss01";-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration-thickness:1px;text-underline-offset:3px}
code,.out{font-variant-ligatures:none}
code{font-family:var(--mono);font-size:.86em;background:var(--accent-soft);color:var(--accent-ink);padding:.08em .32em;border-radius:4px}
button{font:inherit;color:inherit}

/* ---------- barre du haut ---------- */
.top{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--rule)}
.top-in{max-width:1440px;margin:0 auto;padding:.7rem 24px;display:flex;align-items:center;gap:1.2rem}
.brand{font-family:var(--serif);font-weight:600;font-size:1.05rem;letter-spacing:-.01em;color:var(--ink);text-decoration:none;white-space:nowrap}
.brand span{color:var(--ink-3);font-weight:400}
.crumbs{display:flex;align-items:center;gap:.35rem;font-size:.86rem;color:var(--ink-3);min-width:0}
.crumbs a{color:var(--ink-2);text-decoration:none}
.crumbs a:hover{color:var(--accent)}
.top-sp{flex:1}
.pager{display:flex;gap:.25rem}
.pager a{display:inline-flex;align-items:center;gap:.3rem;font-size:.84rem;color:var(--ink-2);text-decoration:none;padding:.32rem .6rem;border-radius:7px}
.pager a:hover{background:var(--card);color:var(--ink)}
.switch{display:inline-flex;align-items:center;gap:.55rem;font-size:.84rem;color:var(--ink-2);cursor:pointer;user-select:none;white-space:nowrap}
.switch input{appearance:none;width:34px;height:20px;border-radius:20px;background:var(--rule-2);position:relative;cursor:pointer;transition:background .2s;margin:0}
.switch input::after{content:"";position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:var(--card);box-shadow:0 1px 2px rgba(0,0,0,.25);transition:transform .2s}
.switch input:checked{background:var(--warm)}
.switch input:checked::after{transform:translateX(14px)}

/* ---------- grille ---------- */
.wrap{max-width:1440px;margin:0 auto;padding:0 24px}
.grid{display:grid;grid-template-columns:72px minmax(0,1fr) 320px;column-gap:48px}
.grid > .full{grid-column:1 / -1}
.grid > .main{grid-column:2}
.grid > .aside{grid-column:3}
body.no-exam .grid{grid-template-columns:72px minmax(0,1fr) 0}
body.no-exam .aside{display:none}

/* ---------- en-tête du sujet ---------- */
.hero{padding:4.2rem 0 2.6rem}
.over{font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);font-weight:600;margin:0 0 1rem}
.over b{color:var(--warm);font-weight:600}
h1{font-family:var(--serif);font-weight:500;font-size:clamp(2.1rem,4.4vw,3.35rem);line-height:1.06;letter-spacing:-.025em;margin:0 0 1.2rem;font-variation-settings:"opsz" 72;max-width:20ch}
.lede{font-size:1.12rem;line-height:1.6;color:var(--ink-2);max-width:60ch;margin:0 0 1.6rem}
.chips{display:flex;flex-wrap:wrap;gap:.4rem;margin:0 0 2rem;padding:0;list-style:none}
.chips li{font-size:.8rem;padding:.26rem .65rem;border-radius:99px;border:1px solid var(--rule-2);color:var(--ink-2);background:var(--card)}
.actions{display:flex;flex-wrap:wrap;gap:.6rem}
.btn{display:inline-flex;align-items:center;gap:.5rem;font-size:.9rem;font-weight:500;padding:.6rem 1rem;border-radius:10px;border:1px solid var(--rule-2);background:var(--card);color:var(--ink);text-decoration:none;cursor:pointer;transition:border-color .15s,transform .15s}
.btn:hover{border-color:var(--ink-3)}
.btn.primary{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.btn.primary:hover{transform:translateY(-1px)}
.btn svg{width:16px;height:16px;flex:none}
.facts{align-self:end;border-left:1px solid var(--rule);padding:.2rem 0 .2rem 1.5rem;font-size:.88rem}
.facts dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:.55rem 1rem}
.facts dt{color:var(--ink-3)}
.facts dd{margin:0;color:var(--ink)}
.facts dd code{font-size:.8em}

/* ---------- sections ---------- */
.sec{padding:2.8rem 0;border-top:1px solid var(--rule)}
.num{font-family:var(--serif);font-size:3.2rem;line-height:1;color:color-mix(in srgb,var(--ink-3) 55%,var(--paper));font-weight:400;text-align:right;padding-top:.15rem;font-variation-settings:"opsz" 72;position:sticky;top:5rem;align-self:start}
.sec.done .num{color:var(--ok)}
h2{font-family:var(--serif);font-weight:500;font-size:1.65rem;letter-spacing:-.015em;line-height:1.2;margin:0 0 1rem}
h2 .kicker{display:block;font-family:var(--sans);font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);font-weight:600;margin-bottom:.45rem}
.consigne p{margin:0 0 .9rem;max-width:70ch}
.consigne ul{margin:0 0 .9rem;padding-left:1.2rem;max-width:68ch}
.consigne li{margin:.25rem 0}
.call{display:inline-flex;align-items:center;gap:.45rem;font-size:.8rem;color:var(--warm);font-weight:500;margin:.2rem 0 1.4rem}
.call svg{width:15px;height:15px}

.formula{display:flex;align-items:center;justify-content:center;gap:.8rem;margin:1.4rem 0 1.6rem;font-family:var(--serif);font-size:1.08rem;padding:1.2rem;background:var(--card);border:1px solid var(--rule);border-radius:12px}
.frac{display:inline-flex;flex-direction:column;align-items:center}
.frac span:first-child{border-bottom:1px solid var(--ink);padding:0 .4rem .2rem}
.frac span:last-child{padding:.2rem .4rem 0}

table.data{border-collapse:collapse;font-size:.86rem;margin:1rem 0 1.4rem;width:100%;max-width:520px;background:var(--card);border:1px solid var(--rule);border-radius:12px;overflow:hidden}
table.data th{font-weight:600;text-align:left;color:var(--ink-3);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;padding:.55rem .9rem;border-bottom:1px solid var(--rule)}
table.data td{padding:.42rem .9rem;border-bottom:1px solid var(--rule);font-variant-numeric:tabular-nums}
table.data tr:last-child td{border-bottom:0}
table.data td.r,table.data th.r{text-align:right}
.cap{font-size:.8rem;color:var(--ink-3);margin:-.8rem 0 1.4rem}
.cands{display:flex;flex-wrap:wrap;gap:.6rem;margin:0 0 1.2rem}
.cands code{font-size:.82rem;padding:.4rem .7rem;border-radius:8px}

/* ---------- cellules ---------- */
.cell{position:relative;margin:1.1rem 0 1.3rem;background:var(--card);border:1px solid var(--rule);border-radius:14px;box-shadow:var(--shadow);overflow:hidden;transition:border-color .2s}
.cell::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--rule-2);transition:background .25s}
.cell[data-state=running]::before{background:var(--accent);animation:pulse 1s ease-in-out infinite}
.cell[data-state=ok]::before{background:var(--ok)}
.cell[data-state=err]::before{background:var(--err)}
@keyframes pulse{50%{opacity:.35}}
.cell-h{display:flex;align-items:center;gap:.6rem;padding:.5rem .6rem .5rem 1rem;border-bottom:1px solid var(--rule)}
.cell-t{font-size:.8rem;color:var(--ink-3);display:flex;align-items:center;gap:.5rem;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cell-t b{color:var(--ink-2);font-weight:500}
.cell-t .file{font-family:var(--mono);font-size:.74rem;color:var(--ink-3)}
.tag{font-size:.68rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;padding:.12rem .45rem;border-radius:5px}
.tag.sol{background:var(--ok-soft);color:var(--ok);display:none}
.cell.is-sol .tag.sol{display:inline-block}
.tag.ro{background:var(--rule);color:var(--ink-3)}
.cell-sp{flex:1}
.tb{display:inline-flex;align-items:center;gap:.35rem;font-size:.8rem;font-weight:500;padding:.34rem .62rem;border-radius:8px;border:1px solid transparent;background:transparent;color:var(--ink-2);cursor:pointer;white-space:nowrap;transition:background .15s,color .15s}
.tb:hover{background:var(--paper);color:var(--ink)}
.tb svg{width:14px;height:14px}
.tb.run{background:var(--ink);color:var(--paper)}
.tb.run:hover{background:var(--accent);color:#fff}
.tb.chk{border-color:var(--rule-2)}
.tb.chk:hover{border-color:var(--ok);color:var(--ok);background:transparent}
.tb.icon{padding:.34rem .45rem}
.tb[disabled]{opacity:.45;pointer-events:none}
.ed .CodeMirror{height:auto;background:var(--code-bg);color:var(--ink);font:13.5px/1.7 var(--mono);padding:.6rem 0;font-variant-ligatures:none}
.ed .CodeMirror-gutters{background:var(--code-bg);border-right:0}
.ed .CodeMirror-linenumber{color:var(--code-gutter);font-size:11.5px;padding:0 .9rem 0 .6rem;min-width:2.2rem}
.ed .CodeMirror-cursor{border-left:2px solid var(--accent)}
.ed .CodeMirror-selected,.ed .CodeMirror-focused .CodeMirror-selected{background:var(--sel)}
.ed .CodeMirror-activeline-background{background:transparent}
.ed .cm-keyword{color:var(--t-kw);font-weight:500}
.ed .cm-def{color:var(--t-def);font-weight:500}
.ed .cm-string{color:var(--t-str)}
.ed .cm-number{color:var(--t-num)}
.ed .cm-comment{color:var(--t-com);font-style:italic}
.ed .cm-builtin{color:var(--t-bi)}
.ed .cm-operator{color:var(--t-op)}
.ed .cm-variable-2{color:var(--ink-2)}
.ed .cm-property{color:var(--ink)}
.ed .cm-atom{color:var(--t-num)}
.ed .CodeMirror-matchingbracket{color:inherit!important;background:var(--accent-soft);border-radius:2px}
.cell.ro .ed .CodeMirror{background:color-mix(in srgb,var(--code-bg) 60%,var(--paper))}
.cell.fold .ed{max-height:7.2rem;overflow:hidden;position:relative}
.cell.fold .ed::after{content:"";position:absolute;left:0;right:0;bottom:0;height:3.5rem;background:linear-gradient(transparent,var(--code-bg))}
.unfold{display:none;width:100%;border:0;border-top:1px solid var(--rule);background:var(--card);padding:.5rem;font-size:.8rem;color:var(--ink-3);cursor:pointer}
.unfold:hover{color:var(--accent)}
.cell.foldable .unfold{display:block}
.out{display:none;border-top:1px solid var(--rule);padding:.75rem 1rem .85rem;font:12.8px/1.6 var(--mono);white-space:pre-wrap;word-break:break-word;color:var(--ink-2);background:var(--card)}
.out.show{display:block}
.out .lbl{display:block;font-family:var(--sans);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);font-weight:600;margin-bottom:.3rem}
.out .e{color:var(--err)}
.out .muted{color:var(--ink-3)}
.checks{list-style:none;margin:0;padding:0;font-family:var(--sans);font-size:.86rem}
.checks li{display:grid;grid-template-columns:1.3rem 1fr;gap:.4rem;padding:.25rem 0;align-items:start}
.checks .ic{display:inline-flex;width:1.1rem;height:1.1rem;border-radius:50%;align-items:center;justify-content:center;font-size:.7rem;font-weight:700;margin-top:.22rem}
.checks .ok .ic{background:var(--ok-soft);color:var(--ok)}
.checks .ko .ic{background:var(--err-soft);color:var(--err)}
.checks .got{display:block;font-family:var(--mono);font-size:.76rem;color:var(--ink-3)}
.checks .ko .got{color:var(--err)}
.score{font-family:var(--sans);font-size:.82rem;font-weight:600;margin:0 0 .4rem}
.score.ok{color:var(--ok)}.score.ko{color:var(--err)}
.hint{font-size:.78rem;color:var(--ink-3);margin:.2rem 0 0}
kbd{font-family:var(--mono);font-size:.72rem;border:1px solid var(--rule-2);border-bottom-width:2px;border-radius:4px;padding:0 .3rem;color:var(--ink-2);background:var(--card)}

/* ---------- marge examinateur ---------- */
.aside{padding-top:.3rem}
.exam{position:sticky;top:5rem;font-size:.88rem;line-height:1.55}
.exam-h{display:flex;align-items:center;gap:.45rem;font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--warm);font-weight:700;margin:0 0 .8rem}
.exam-h::before{content:"";width:18px;height:1px;background:var(--warm)}
.exam ol{margin:0 0 1.2rem;padding:0;list-style:none;counter-reset:q}
.exam ol li{counter-increment:q;position:relative;padding:0 0 0 1.7rem;margin:0 0 .85rem;color:var(--ink)}
.exam ol li::before{content:counter(q);position:absolute;left:0;top:.08rem;width:1.2rem;height:1.2rem;border-radius:50%;background:var(--warm-soft);color:var(--warm);font-size:.7rem;font-weight:700;display:flex;align-items:center;justify-content:center}
.exam code{font-size:.8em}
.vig{border-left:2px solid var(--rule-2);padding:.1rem 0 .1rem .9rem;margin:0 0 1.1rem;color:var(--ink-2)}
.vig b{display:block;font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3);margin-bottom:.25rem}
.vig p{margin:0 0 .4rem}
details.exp{border:1px solid var(--rule);border-radius:10px;background:var(--card)}
details.exp summary{cursor:pointer;list-style:none;padding:.55rem .8rem;font-size:.82rem;font-weight:500;color:var(--ink-2);display:flex;align-items:center;gap:.4rem}
details.exp summary::-webkit-details-marker{display:none}
details.exp summary::before{content:"";width:6px;height:6px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(-45deg);transition:transform .2s;margin-right:.2rem}
details.exp[open] summary::before{transform:rotate(45deg)}
details.exp .b{padding:0 .8rem .7rem;font-size:.84rem}
details.exp dl{margin:0;display:grid;grid-template-columns:1fr auto;gap:.3rem .8rem}
details.exp dt{color:var(--ink-3)}
details.exp dd{margin:0;font-variant-numeric:tabular-nums;font-weight:500;text-align:right}
details.exp p{margin:.5rem 0 0;color:var(--ink-2)}

/* ---------- fin ---------- */
.final{padding:3rem 0 4rem;border-top:1px solid var(--rule)}
.final .card{background:var(--card);border:1px solid var(--rule);border-radius:16px;padding:1.6rem 1.7rem;box-shadow:var(--shadow)}
.final h2{margin-bottom:.4rem}
.final p{color:var(--ink-2);margin:0 0 1.2rem;max-width:62ch}
footer{border-top:1px solid var(--rule);padding:2rem 0 3rem;font-size:.82rem;color:var(--ink-3)}
footer p{margin:.2rem 0}

.pystat{position:fixed;right:18px;bottom:18px;z-index:30;display:flex;align-items:center;gap:.5rem;font-size:.78rem;color:var(--ink-2);background:var(--card);border:1px solid var(--rule);padding:.42rem .75rem .42rem .6rem;border-radius:99px;box-shadow:var(--shadow);opacity:0;transform:translateY(8px);transition:opacity .25s,transform .25s;pointer-events:none}
.pystat.show{opacity:1;transform:none}
.pystat i{width:8px;height:8px;border-radius:50%;background:var(--warm);animation:pulse 1s infinite}
.pystat.ready i{background:var(--ok);animation:none}

/* ---------- adaptatif ---------- */
@media (max-width:1100px){
  .grid{grid-template-columns:52px minmax(0,1fr);column-gap:24px}
  .grid > .aside{grid-column:2}
  body.no-exam .grid{grid-template-columns:52px minmax(0,1fr)}
  .exam{position:static;background:var(--warm-soft);border-radius:14px;padding:1.1rem 1.2rem .4rem;margin-top:.4rem}
  .num{font-size:2.4rem}
  .hero .facts{grid-column:2;border-left:0;border-top:1px solid var(--rule);padding:1.2rem 0 0;margin-top:2rem}
}
@media (max-width:640px){
  .wrap,.top-in{padding-left:16px;padding-right:16px}
  .grid{grid-template-columns:minmax(0,1fr);column-gap:0}
  .grid > .main,.grid > .aside,.hero .facts{grid-column:1}
  body.no-exam .grid{grid-template-columns:minmax(0,1fr)}
  .num{display:none}
  .top-in{gap:.7rem}
  .switch .lbl{display:none}
  .cell-t .file{display:none}
  .ed .CodeMirror{font-size:12.5px}
  .crumbs,.pager .lbl{display:none}
  .hero{padding-top:2.4rem}
  .tb .lbl{display:none}
  .tb.run .lbl{display:inline}
}

/* ---------- pages de liste (accueil, session) ---------- */
.intro{padding:4.2rem 0 2.4rem;max-width:62rem}
.intro .lede{max-width:62ch}
.points{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,15rem),1fr));gap:1.2rem 2rem;margin:2.2rem 0 0;padding:1.6rem 0 0;border-top:1px solid var(--rule);list-style:none}
.points li b{display:block;font-family:var(--serif);font-weight:500;font-size:1.12rem;margin-bottom:.2rem}
.points li{color:var(--ink-2);font-size:.92rem}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,22rem),1fr));gap:1.1rem;padding:1rem 0 3.5rem}
.card-s{display:flex;flex-direction:column;gap:.55rem;background:var(--card);border:1px solid var(--rule);border-radius:16px;padding:1.3rem 1.4rem 1.2rem;text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:transform .18s,border-color .18s}
.card-s:hover{transform:translateY(-2px);border-color:var(--rule-2)}
.card-s .n{font-family:var(--serif);font-size:2.4rem;line-height:1;color:color-mix(in srgb,var(--ink-3) 55%,var(--paper))}
.card-s h3{font-family:var(--serif);font-weight:500;font-size:1.3rem;line-height:1.2;letter-spacing:-.01em;margin:0}
.card-s p{margin:0;color:var(--ink-2);font-size:.9rem;line-height:1.55}
.card-s .chips{margin:.3rem 0 0}
.card-s .chips li{font-size:.72rem;padding:.16rem .5rem}
.card-s .go{margin-top:auto;padding-top:.4rem;font-size:.84rem;font-weight:500;color:var(--accent)}
.card-s.soon{box-shadow:none;background:transparent;border-style:dashed;cursor:default}
.card-s.soon:hover{transform:none;border-color:var(--rule)}
.card-s.soon h3{color:var(--ink-3)}
.sec-t{font-family:var(--sans);font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);font-weight:600;margin:0;padding:2rem 0 .4rem;border-top:1px solid var(--rule)}
pre.snippet{margin:0 0 1rem;padding:.8rem 1rem;background:var(--code-bg);border:1px solid var(--rule);border-radius:10px;overflow-x:auto;font:12.5px/1.6 var(--mono);font-variant-ligatures:none}
pre.snippet code{background:none;padding:0;color:var(--ink);font-size:inherit;white-space:pre}
.img-sortie{margin:.7rem 0 .2rem;font-family:var(--sans)}
.img-sortie img{display:block;max-width:100%;height:auto;border:1px solid var(--rule);border-radius:8px;background:#fff;image-rendering:auto}
.img-sortie figcaption{font-size:.74rem;color:var(--ink-3);margin-top:.3rem}